import java.util.Scanner;

public class p5720 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int day = 1;
        while (a > 1) {
            a = a / 2;
            day++;
        }
        System.out.println(day);
        scanner.close();
    }
}
